Operations at Alstom SA's London Underground Train Depot

Bloomberg

An employee places a safety sign on to the front a London Underground Northern Line train at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

An employee places a safety sign on to the front a London Underground Northern Line train at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Operations at Alstom SA's London Underground Train Depot

Bloomberg

London Underground Northern Line trains stand in sidings at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

London Underground Northern Line trains stand in sidings at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Operations at Alstom SA's London Underground Train Depot

Bloomberg

An employee tests the electronic destination screens of a London Underground Northern Line train at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

An employee tests the electronic destination screens of a London Underground Northern Line train at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Operations at Alstom SA's London Underground Train Depot

Bloomberg

An employee works beneath the carriage of a London Underground Northern Line train at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

An employee works beneath the carriage of a London Underground Northern Line train at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Operations at Alstom SA's London Underground Train Depot

Bloomberg

An employee works underneath a London Underground Northern Line train at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

An employee works underneath a London Underground Northern Line train at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Operations at Alstom SA's London Underground Train Depot

Bloomberg

An employee works on electrical wiring beneath a London Underground Northern Line train at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

An employee works on electrical wiring beneath a London Underground Northern Line train at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Operations at Alstom SA's London Underground Train Depot

Bloomberg

An employee works on electronic equipment inside the drivers cab of a London Underground Northern Line train at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

An employee works on electronic equipment inside the drivers cab of a London Underground Northern Line train at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Operations at Alstom SA's London Underground Train Depot

Bloomberg

A London Underground Northern Line train stands in the sidings at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

A London Underground Northern Line train stands in the sidings at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Operations at Alstom SA's London Underground Train Depot

Bloomberg

An employee works beneath a carriage of a London Underground Northern Line train at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

An employee works beneath a carriage of a London Underground Northern Line train at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Operations at Alstom SA's London Underground Train Depot

Bloomberg

Safety signs and employees security tags hang from the front of a London Underground Northern Line train at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Safety signs and employees security tags hang from the front of a London Underground Northern Line train at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Operations at Alstom SA's London Underground Train Depot

Bloomberg

An employee walks past a London Underground Northern Line train at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

An employee walks past a London Underground Northern Line train at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Operations at Alstom SA's London Underground Train Depot

Bloomberg

An employee works in an inspection pit beneath a London Underground Northern Line train at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

An employee works in an inspection pit beneath a London Underground Northern Line train at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Operations at Alstom SA's London Underground Train Depot

Bloomberg

An employee tests batteries for London Underground Northern Line trains at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

An employee tests batteries for London Underground Northern Line trains at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Operations at Alstom SA's London Underground Train Depot

Bloomberg

Bogies from a London Underground northern line train sit in a storage area at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Bogies from a London Underground northern line train sit in a storage area at Alstom SA's Traincare Centre in the Golders Green district of London, U.K., on Wednesday, Nov. 21, 2012. Transport for London (TFL), who oversee the U.K. capital's public transport system, issued 300 million pounds ($476 million) of bonds five months ahead of schedule to take advantage of investor demand as it continues its 35 billion-pound transport investment program. Photographer: Chris Ratcliffe/Bloomberg via Getty Images